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Annotation of sys/arch/alpha/alpha/disksubr.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: disksubr.c,v 1.89 2007/06/20 18:15:45 deraadt Exp $   */
                      2: /*     $NetBSD: disksubr.c,v 1.21 1996/05/03 19:42:03 christos Exp $   */
                      3:
                      4: /*
                      5:  * Copyright (c) 1997 Niklas Hallqvist
                      6:  * Copyright (c) 1996 Theo de Raadt
                      7:  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
                      8:  * All rights reserved.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. Neither the name of the University nor the names of its contributors
                     19:  *    may be used to endorse or promote products derived from this software
                     20:  *    without specific prior written permission.
                     21:  *
                     22:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     23:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     24:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     25:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     26:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     27:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     28:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     29:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     30:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     31:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     32:  * SUCH DAMAGE.
                     33:  */
                     34:
                     35: #include <sys/param.h>
                     36: #include <sys/systm.h>
                     37: #include <sys/buf.h>
                     38: #include <sys/disklabel.h>
                     39: #include <sys/disk.h>
                     40:
                     41: /*
                     42:  * Attempt to read a disk label from a device
                     43:  * using the indicated strategy routine.
                     44:  * The label must be partly set up before this:
                     45:  * secpercyl, secsize and anything required for a block i/o read
                     46:  * operation in the driver's strategy/start routines
                     47:  * must be filled in before calling us.
                     48:  *
                     49:  * Returns null on success and an error string on failure.
                     50:  */
                     51: char *
                     52: readdisklabel(dev_t dev, void (*strat)(struct buf *),
                     53:     struct disklabel *lp, int spoofonly)
                     54: {
                     55:        struct buf *bp = NULL;
                     56:        char *msg;
                     57:
                     58:        if ((msg = initdisklabel(lp)))
                     59:                goto done;
                     60:
                     61:        /* get a buffer and initialize it */
                     62:        bp = geteblk((int)lp->d_secsize);
                     63:        bp->b_dev = dev;
                     64:
                     65:        if (spoofonly)
                     66:                goto doslabel;
                     67:
                     68:        bp->b_blkno = LABELSECTOR;
                     69:        bp->b_bcount = lp->d_secsize;
                     70:        bp->b_flags = B_BUSY | B_READ;
                     71:        (*strat)(bp);
                     72:        if (biowait(bp)) {
                     73:                msg = "disk label read error";
                     74:                goto done;
                     75:        }
                     76:
                     77:        msg = checkdisklabel(bp->b_data + LABELOFFSET, lp);
                     78:        if (msg == NULL)
                     79:                goto done;
                     80:
                     81: doslabel:
                     82:        msg = readdoslabel(bp, strat, lp, NULL, spoofonly);
                     83:        if (msg == NULL)
                     84:                goto done;
                     85:
                     86: #if defined(CD9660)
                     87:        if (iso_disklabelspoof(dev, strat, lp) == 0) {
                     88:                msg = NULL;
                     89:                goto done;
                     90:        }
                     91: #endif
                     92: #if defined(UDF)
                     93:        if (udf_disklabelspoof(dev, strat, lp) == 0) {
                     94:                msg = NULL;
                     95:                goto done;
                     96:        }
                     97: #endif
                     98:
                     99: done:
                    100:        if (bp) {
                    101:                bp->b_flags |= B_INVAL;
                    102:                brelse(bp);
                    103:        }
                    104:        return (msg);
                    105: }
                    106:
                    107: /*
                    108:  * Write disk label back to device after modification.
                    109:  */
                    110: int
                    111: writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
                    112: {
                    113:        u_int64_t csum = 0, *p;
                    114:        struct disklabel *dlp;
                    115:        struct buf *bp = NULL;
                    116:        int error, i;
                    117:
                    118:        /* get a buffer and initialize it */
                    119:        bp = geteblk((int)lp->d_secsize);
                    120:        bp->b_dev = dev;
                    121:
                    122:        bp->b_blkno = LABELSECTOR;
                    123:        bp->b_bcount = lp->d_secsize;
                    124:        bp->b_flags = B_BUSY | B_READ;
                    125:        (*strat)(bp);
                    126:        if ((error = biowait(bp)) != 0)
                    127:                goto done;
                    128:
                    129:        /* Write it in the regular place. */
                    130:        dlp = (struct disklabel *)(bp->b_data + LABELOFFSET);
                    131:        *dlp = *lp;
                    132:
                    133:        /* Alpha bootblocks require a checksum over the sector */
                    134:        for (i = 0, p = (u_int64_t *)bp->b_data; i < 63; i++)
                    135:                csum += *p++;
                    136:        *p = csum;
                    137:
                    138:        bp->b_flags = B_BUSY | B_WRITE;
                    139:        (*strat)(bp);
                    140:        error = biowait(bp);
                    141:
                    142: done:
                    143:        if (bp) {
                    144:                bp->b_flags |= B_INVAL;
                    145:                brelse(bp);
                    146:        }
                    147:        return (error);
                    148: }